Hot Spare feature
Your system supports the Hot Spare feature that significantly reduces the power overhead associated
with PSU redundancy.
When the Hot Spare feature is enabled, one of the redundant PSUs is switched to the sleep state. The
active PSU supports 100 percent of the load, thus operating at higher efficiency. The PSU in the sleep
state monitors output voltage of the active PSU. If the output voltage of the active PSU drops, the PSU in
the sleep state returns to an active output state.
If having both PSUs active is more efficient than having one PSU in a sleep state, the active PSU can also
activate a sleeping PSU.
The default PSU settings are as follows:
• If the load on the active PSU is more than 50 percent , the redundant PSU is switched to the active
state.
• If the load on the active PSU falls below 20 percent, the redundant PSU is switched to the sleep state.
You can configure the Hot Spare feature by using the iDRAC settings. For more information about iDRAC
settings, see the Integrated Dell Remote Access Controller User’s Guide at dell.com/support/home.
Removing PSU blank
If you are installing a second PSU, remove the PSU blank in the bay by pulling the blank outward.
CAUTION: To ensure proper system cooling, the PSU blank must be installed in the second
PSU bay in a non-redundant configuration. Remove the PSU blank only if you are installing a
second PSU.
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